Moritz, Thank you -- v.to.points seems as if it should do what I want -- I'm not sure how I missed seeing this. My wife says I have "guy sight" and often miss seeing something plainly in view.
Best, Tom On Tue, Apr 15, 2014 at 7:50 AM, Moritz Lennert < [email protected]> wrote: > On 15/04/14 13:03, Thomas Adams wrote: > >> Moritz et al, >> >> Thank you for the helpful suggestions. One of the problems I have is >> that about half of the points are in a tidal estuary where the >> elevations are all zero (sea level); so utilizing the elevations to sort >> will not work -- I have several thousand points I'm dealing with, which >> I obtained by doing a vect-->rast conversion and then got the points >> from the rast (I know this sounds screwy). >> >> I have to explain what I'm doing. I want to use r.inund.fluv to generate >> a flood inundation map. The problem stems from the fact that I have a >> USACE HEC-RAS model implementation which was not georeferenced, from >> which I have modeled water surface elevations from a historic flood. >> From an ascii output file, I basically have the channel centerline >> locations (x,y) and water surface elevations and I have calculated the >> distance to the river mouth at each point. In GRASS I have >> independently, using a UTM map projection, the channel centerline as a >> vector. I have also identified the corresponding upstream and downstream >> end points, which identify the same locations -- so I plan I 'mapping' >> the HEC-RAS water-surface elevations (WSEL) at the un-georeferenced >> channel centerline locations based on scaling the entire river reach >> length between this data and what I have in GRASS. I can use the scaled >> distance from the river mouth to spatially interpolate locations where I >> know the WSEL. >> >> The GRASS addon command r.inund.fluv needs X, Y, WSEL as an ascii file. >> >> Now if I can go directly from the GRASS vector centerline and output >> verticies of that feature, so I have the x,y locations of the verticies >> my problem would be solved. I looked at v.distance and other modules but >> could not see how to generate the verticies and export them -- but, in >> the end, I need an ascii file of centerline point locations in upstream >> to downstream order. >> > > v.to.points ? If you only want vertices, use the -v flag. > > Moritz >
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